Several questions that lead to how /if one can apply the Materials Reuse strategy to a lighting fixture that uses reclaimed wood for its housing/support frame etc.

First, can architectural, (hard-wired) lighting fixtures be includeded in the MR credits in v4.1? In LEED v4 there was a CIR ((ID# 10409) (https://www.usgbc.org/leedaddenda/10409 and https://www.usgbc.org/guide/bdc) that expanded the definition to include CSI divisions 11, 21-28 and other specialty divisions to that definition.  Lighting is Div 26, but not explicitly named in that CIR so would like confirmation for this in v4.1. 

If indeed counted towards MR credits, can the reclaimed wood that the manufacturer uses in the product be applied towards the MR Sourcing of Raw Materials credit via tha Materials Reuse strategy?  If so, does one still use the LEED v4 calculation for determining material contributions of an assembly as cited below:? 

"Calculate the value that contributes toward credit compliance as the percentage, by weight, of the material or component that meets the criteria, multiplied by the total product cost.

product value ($) = Total product cost ($) x (%) product component by weight x (%) meeting sustainable criteria."

Further, I would like to confirm that lamps and decorative light fixtures are included in MR credits in CI v4.1. Several stings on this theme but all pertaining to LEED v4.

Thanks!